CN103346787A - Phase-locked loop frequency synthesizer structure with automatic frequency correction - Google Patents
Phase-locked loop frequency synthesizer structure with automatic frequency correction Download PDFInfo
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Abstract
The invention discloses a phase-locked loop frequency synthesizer circuit structure with an automatic frequency correction circuit. Through measurement of each frequency band range of a phase-locked loop circuit after tape-out production, actual frequency ranges corresponding to different frequency band control codes chosen for a voltage-controlled oscillator are obtained. Due to the facts that actually, a phase-locked loop frequency synthesizer controls frequency of an output signal through changing of the frequency division ratio of a feedback loop, and after the actual frequency ranges corresponding to the control codes are obtained, frequency division ratio codes are established accordingly in a lookup table of the frequency band control codes, in comparison with an existing phase-locked loop frequency synthesizer, the phase-locked loop frequency synthesizer circuit structure can rapidly obtain correct frequency band control codes when running after one-time test correction.
Description
Technical field
The present invention relates to a kind of phase-locked loop frequency integrator structure of improved band automatic frequency correction circuit, it is more insensitive and make the automatic frequency correction circuit determine the circuit of the control coding of voltage controlled oscillator more quickly to process deviation to relate in particular to a kind of circuit that can make.
Background technology
Along with CMOS technology characteristics size constantly reduces, cmos circuit is more and more stronger to the sensitiveness of process deviation, and this circuit performance issue that makes actual production go out is inhomogeneous, thereby causes design pressure increase, power consumption raising, yield to reduce.In the phase-locked loop frequency integrator circuit, because the existence of process deviation makes actual electric capacity and the design load of making have gap, this can cause the frequency band actual range of phase-locked loop correspondence inconsistent with design.In addition, in order to obtain phase noise performance preferably, the Kvco value of voltage controlled oscillator must be enough little, because the output frequency of voltage controlled oscillator must cover enough big scope, realize the switching of different output bands so adopt usually by the electric capacity of digit order number (i.e. control coding) the different sizes of gating again.Because process deviation makes the frequency band actual range change, and therefore needs the automatic frequency correction circuit that the actual circuit that produces is proofreaied and correct, when operation, select suitable control coding could export the signal of the frequency of anticipation.
Summary of the invention
Find suitable voltage controlled oscillator control coding under the condition that has certain process deviation fast in order to be implemented in.
The technical solution adopted in the present invention is: a kind of phase-locked loop frequency integrator structure that has automatic frequency correction, it is characterized in that entire circuit is made of phase frequency detector, charge pump, low pass filter, voltage controlled oscillator, frequency divider, frequency counter, lut circuits, MUX, control circuit; Wherein the two-way input signal of phase frequency detector is reference frequency signal and voltage controlled oscillator output process frequency divider frequency division signal afterwards, and output signal is as the input signal of charge pump; The input signal of charge pump is the output signal of phase frequency detector, and output signal is as the input signal of low pass filter; The input signal of low pass filter is charge pump output signal, and output signal is through the output signal of gate-controlled switch as voltage controlled oscillator; Voltage controlled oscillator has three input signals, be respectively the control coding of output signal, the MUX output of low pass filter, the power supply/earth potential by the gate-controlled switch gating, the output signal of voltage controlled oscillator is output signal, frequency divider input signal, the counter input signal of entire circuit simultaneously, and voltage controlled oscillator output process gate-controlled switch is afterwards as the counter input signal; The frequency dividing ratio coding that the input signal of frequency divider comprises the output signal of voltage controlled oscillator and adds, output signal is as one tunnel input of phase frequency detector; The input signal of counter is added through gate-controlled switch by voltage controlled oscillator, and output signal is imported as look-up table; Two input signals of lut circuits are respectively counter output and frequency divider frequency dividing ratio coding, and output signal is as one tunnel output signal of MUX; A road of MUX is input as look-up table output, and another road is that the test of control circuit output is encoded with control, selects signal from control circuit, and output is as the control coding of voltage controlled oscillator; Control circuit output comprises that test selects all gate-controlled switches in signal, the entire circuit with voltage controlled oscillator control coding, MUX.
The invention has the beneficial effects as follows, the present invention proposes a kind of new phase-locked loop frequency integrator structure that has automatic frequency correction, can finish the search that suitable voltage controlled oscillator control is encoded with the time shorter than existing phase-locked loop circuit, realize that frequency is switched more fast.
Description of drawings
Fig. 1 is the new type auto frequency correction phase-locked loop frequency integrator of the present invention structural system block diagram.
Embodiment
Principle of the present invention is: the phase-locked loop frequency integrator circuit after the flow is tested with the control coding by the practicality test, obtain the actual frequency scope of the corresponding frequency band of each control coding, set up the look-up table that frequency dividing ratio is encoded to voltage controlled oscillator control coding accordingly, thereby realize controlling determining fast of coding fast, and then realize than the frequency switching faster of existing phase-locked loop frequency integrator circuit.
Below in conjunction with accompanying drawing method of the present invention is further specified.
Figure 1 shows that new type auto frequency correction phase-locked loop frequency integrator structural system block diagram, entire circuit is made of phase frequency detector, charge pump, low pass filter, voltage controlled oscillator, frequency divider, frequency counter, lut circuits, MUX, control circuit; Wherein the two-way input signal of phase frequency detector is reference frequency signal and voltage controlled oscillator output process frequency divider frequency division signal afterwards, and output signal is as the input signal of charge pump; The input signal of charge pump is the output signal of phase frequency detector, and output signal is as the input signal of low pass filter; The input signal of low pass filter is charge pump output signal, and output signal is through the output signal of gate-controlled switch as voltage controlled oscillator; Voltage controlled oscillator has three input signals, be respectively the control coding of output signal, the MUX output of low pass filter, the power supply/earth potential by the gate-controlled switch gating, the output signal of voltage controlled oscillator is output signal, frequency divider input signal, the counter input signal of entire circuit simultaneously, and voltage controlled oscillator output process gate-controlled switch is afterwards as the counter input signal; The frequency dividing ratio coding that the input signal of frequency divider comprises the output signal of voltage controlled oscillator and adds, output signal is as one tunnel input of phase frequency detector; The input signal of counter is added through gate-controlled switch by voltage controlled oscillator, and output signal is imported as look-up table; Two input signals of lut circuits are respectively counter output and frequency divider frequency dividing ratio coding, and output signal is as one tunnel output signal of MUX; A road of MUX is output as look-up table output, and another road is that the test of control circuit output is encoded with control, and output is as the control coding of voltage controlled oscillator; Control circuit output comprises that test is with all gate-controlled switches in voltage controlled oscillator control coding and the entire circuit.
Each module of using among the present invention except control circuit, all can be used existing implementation.The realization of the control circuit that uses among the present invention, concrete technical requirement in the time of need realizing according to reality and the parameter of other modules could be determined, the realization of control circuit can be according to the description of operation principle, be described and comprehensively go out circuit diagram by hardware description languages such as verilog HDL or VHDL, this is not difficult to accomplish for the technical staff who is engaged in integrated circuit (IC) design.
The phase-locked loop frequency integrator course of work that proposes among the present invention is: before bringing into operation, at first will test each frequency band actual frequency scope of voltage controlled oscillator: the gate-controlled switch between low pass filter and the voltage controlled oscillator disconnects, the test that the MUX gate control circuit produces is encoded with control, gate-controlled switch closure between voltage controlled oscillator and the counter, the control circuit control counter was counted the sine wave that voltage controlled oscillator produces in a certain set time, meanwhile, control switch is exported different control codings one by one, and successively come to add power supply potential or earth potential to voltage controlled oscillator control voltage by gate-controlled switch, by counter the highest and low-limit frequency of each frequency band is measured thus.According to the actual band frequency range that measures, reference signal frequency, frequency dividing ratio scope, can draw the corresponding voltage controlled oscillator control coding of different frequency dividing ratio codings by simple combinational logic circuit design, set up look-up table accordingly, so far test process finishes, and circuit brings into operation.The control coding of MUX gating look-up table output, gate-controlled switch between voltage controlled oscillator and the counter disconnects, power supply/earthy gate-controlled switch that control circuit outputs to voltage controlled oscillator control voltage end disconnects, gate-controlled switch closure between low pass filter and the voltage controlled oscillator, normal operation circuit.Existing phase-locked loop frequency integrator will be searched for suitable control coding again after frequency dividing ratio changes, this can take a long time, and is difficult to realize quick lock in.After the new phase-locked loop circuit structure that the present invention provides can be finished test, when frequency dividing ratio changes, in the extremely short time (only being the look-up table propagation delay), determine suitable voltage controlled oscillator control coding, realize that frequency is switched fast.
Claims (1)
1. phase-locked loop frequency integrator structure that has automatic frequency correction, it is characterized in that entire circuit is made of phase frequency detector, charge pump, low pass filter, voltage controlled oscillator, frequency divider, frequency counter, lut circuits, MUX, control circuit; Wherein the two-way input signal of phase frequency detector is reference frequency signal and voltage controlled oscillator output process frequency divider frequency division signal afterwards, and output signal is as the input signal of charge pump; The input signal of charge pump is the output signal of phase frequency detector, and output signal is as the input signal of low pass filter; The input signal of low pass filter is charge pump output signal, and output signal is through the output signal of gate-controlled switch as voltage controlled oscillator; Voltage controlled oscillator has three input signals, be respectively the control coding of output signal, the MUX output of low pass filter, the power supply/earth potential by the gate-controlled switch gating, the output signal of voltage controlled oscillator is output signal, frequency divider input signal, the counter input signal of entire circuit simultaneously, and voltage controlled oscillator output process gate-controlled switch is afterwards as the counter input signal; The frequency dividing ratio coding that the input signal of frequency divider comprises the output signal of voltage controlled oscillator and adds, output signal is as one tunnel input of phase frequency detector; The input signal of counter is added through gate-controlled switch by voltage controlled oscillator, and output signal is imported as look-up table; Two input signals of lut circuits are respectively counter output and frequency divider frequency dividing ratio coding, and output signal is as one tunnel output signal of MUX; A road of MUX is input as look-up table output, and another road is that the test of control circuit output is encoded with control, selects signal from control circuit, and output is as the control coding of voltage controlled oscillator; Control circuit output comprises that test selects all gate-controlled switches in signal, the entire circuit with voltage controlled oscillator control coding, MUX.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135285A (en) * | 2014-08-07 | 2014-11-05 | 上海交通大学 | Frequency calibration circuit and method thereof |
| CN105119600A (en) * | 2015-09-18 | 2015-12-02 | 东南大学 | AFC (Automatic Frequency Calibration) method for realizing rapid locking of a phase-locked loop system |
| CN106385254A (en) * | 2016-10-13 | 2017-02-08 | 中国电子科技集团公司第五十八研究所 | Frequency band scanning circuit for LC type phase locked loop |
| CN107005244A (en) * | 2017-02-08 | 2017-08-01 | 香港应用科技研究院有限公司 | Reduction by overflowing counter counts the gain calibration for the direct modulation synthesizer searched for using look-up table |
| CN107846222A (en) * | 2017-11-16 | 2018-03-27 | 上海华虹集成电路有限责任公司 | A kind of digital analog converter gain self-calibration circuit |
| CN108155906A (en) * | 2017-12-30 | 2018-06-12 | 广州市广晟微电子有限公司 | It is a kind of can coarse adjustment phase-lock-ring output frequency frequency synthesizer and coarse tuning method |
| WO2019127537A1 (en) * | 2017-12-29 | 2019-07-04 | 海能达通信股份有限公司 | Wideband low-phase-noise frequency synthesizer circuit and electronic device |
| CN110798207A (en) * | 2019-09-29 | 2020-02-14 | 浙江大学 | Phase-locked loop bandwidth expanding circuit |
| CN113098501A (en) * | 2021-06-07 | 2021-07-09 | 成都市克莱微波科技有限公司 | Design method of broadband miniaturization rapid frequency synthesis |
| CN113848384A (en) * | 2021-09-22 | 2021-12-28 | 浙江大学 | High-precision feedback type frequency measuring device and method based on phase frequency detector |
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| CN102045063A (en) * | 2009-10-12 | 2011-05-04 | 晨星软件研发(深圳)有限公司 | Control circuit for voltage controlled oscillator of phase locked loop and control method of control circuit |
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| US7856050B1 (en) * | 2007-08-15 | 2010-12-21 | L-3 Communications Titan Corporation | Receiver and transmitter calibration to compensate for frequency dependent I/Q imbalance |
| CN102017422A (en) * | 2008-05-07 | 2011-04-13 | 高通股份有限公司 | VCO capacitor bank trimming and calibration |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135285B (en) * | 2014-08-07 | 2017-02-15 | 上海交通大学 | Frequency calibration circuit and method thereof |
| CN104135285A (en) * | 2014-08-07 | 2014-11-05 | 上海交通大学 | Frequency calibration circuit and method thereof |
| CN105119600A (en) * | 2015-09-18 | 2015-12-02 | 东南大学 | AFC (Automatic Frequency Calibration) method for realizing rapid locking of a phase-locked loop system |
| CN105119600B (en) * | 2015-09-18 | 2017-11-17 | 东南大学 | A kind of automatic band calibration method for making phase-locked loop systems quick lock in |
| CN106385254B (en) * | 2016-10-13 | 2019-04-19 | 中国电子科技集团公司第五十八研究所 | A kind of frequency scan circuit for LC type phaselocked loop |
| CN106385254A (en) * | 2016-10-13 | 2017-02-08 | 中国电子科技集团公司第五十八研究所 | Frequency band scanning circuit for LC type phase locked loop |
| CN107005244A (en) * | 2017-02-08 | 2017-08-01 | 香港应用科技研究院有限公司 | Reduction by overflowing counter counts the gain calibration for the direct modulation synthesizer searched for using look-up table |
| CN107005244B (en) * | 2017-02-08 | 2020-05-05 | 香港应用科技研究院有限公司 | Gain calibration of direct modulation synthesizer using look-up table search by decreasing count of overflow counter |
| CN107846222A (en) * | 2017-11-16 | 2018-03-27 | 上海华虹集成电路有限责任公司 | A kind of digital analog converter gain self-calibration circuit |
| WO2019127537A1 (en) * | 2017-12-29 | 2019-07-04 | 海能达通信股份有限公司 | Wideband low-phase-noise frequency synthesizer circuit and electronic device |
| CN108155906A (en) * | 2017-12-30 | 2018-06-12 | 广州市广晟微电子有限公司 | It is a kind of can coarse adjustment phase-lock-ring output frequency frequency synthesizer and coarse tuning method |
| CN110798207A (en) * | 2019-09-29 | 2020-02-14 | 浙江大学 | Phase-locked loop bandwidth expanding circuit |
| CN110798207B (en) * | 2019-09-29 | 2021-12-17 | 浙江大学 | Phase-locked loop bandwidth expanding circuit |
| CN113098501A (en) * | 2021-06-07 | 2021-07-09 | 成都市克莱微波科技有限公司 | Design method of broadband miniaturization rapid frequency synthesis |
| CN113848384A (en) * | 2021-09-22 | 2021-12-28 | 浙江大学 | High-precision feedback type frequency measuring device and method based on phase frequency detector |
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Application publication date: 20131009 |